I haven't purchased on line but in "the old days" when I was doing that sort of thing I had to know how long the redemption period was in order to protect my interest.

I have done some checking and the county treasurer told me that there is a 3 yr redemption period so you would have to pay the taxes for the 3 yrs and if they don't get redeemed you can proceed further.  

The main risk in my opinion is not knowing what you are bidding on.Check for IRS and state liens.Also while you are waiting on redemption period to end (which is very short in TX), something could happen to property.

I don’t know how the PA system works but you’d likely have to foreclose and the previous owner likely has a redemption period.

Ones behind are, though they may have redemption rights.The title search will (or, at least should) turn up all the liens and judgments on the property.

They do tax sales like every 2 yearsI can be a jerk with the open records act and all but thought it would be easier to just buy the information.. and skip searching with just the white pages usually nets my results, Not whole lot of money to be made but it looks like a good livingNow to answer the question about the redemption period, if the redemption amount is low enough, it works.

If you still want to use liens to get a property, look at states like South Carolina or Indiana where the redemption period is short.

Finally, get title to the property (assuming there is no redemption period), only to find there are squatters in the house.

I've watched the same property go to auction 3-4 times this way.2) In Texas there is a redemption period that is different for Homestead vs non-Homestead property.  

CO is a 15 day redemption state for JR lienholders only.